*{
    padding: 0;
    margin: 0;
}
.header-nav{
    background-color: black;
    height: 60px;
}
.header-nav-middle{
    width: 1200px;
    margin: 0 auto;
    height: 100%;
}
div{
    display: block;
}
.header-nav-item{
    margin-left: 25px;
    line-height: 56px;
    font-size: 16px;
    color: #aaa;
    cursor: pointer;
    text-decoration:none;
}
.header-nav-bottom{
    background-color: #f2f2f2;
    height: 60px;
}
/*    中间*/
.content{
    background-color: #f2f2f2;
    height: 650px;
}
.content-container{
    width: 1200px;
    height: 100%;
    margin: 0 auto;
    overflow: hidden;
    position: relative;
    /*background-color: red;*/
}
